[SOLVED] convertd no more running after upgrade from 6.06 to 6.10

I upgraded 2 weeks ago from zimbra 6.06 (NE) to 6.010 (NE), but through and intermediate an erroneous upgrade to 6.10 (OS)

Now, convertd service does not run anymore. I do not know if it run before the upgrade, but for sure it did not appear as stopped in the admin pages.

Is is not clear for me, what is the function of this process.(nothing mentionned in the admin doc, and found nothing very clear for me in the wiki). To be clear, should I worry about this?

If this service is needed, how should I proceeded to make it working?

FYI when starting this service I got the following error:> zmconvertctl start
Starting convertd...httpd: Could not open configuration file /opt/zimbra/convertd/conf/httpd.conf: No such file or directory failed.
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